Bi-O Recording Layer for Blue Laser Data Reliability
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Solution Overview
Problem
Conventional optical recording media using organic dyes with blue or blue violet laser light face challenges in achieving satisfactory optical changes for data recording while maintaining durability, and inorganic materials containing Bi and O often fail to provide desired optical characteristics and are prone to variations in reflectance and light transmittance, leading to low data recording and reproduction accuracy.
Innovation Solution
An optical recording medium with a recording layer composed mainly of Bi and O, where the ratio of O atoms is 63% or higher, enhancing the difference in reflectance between recording marks and non-mark areas, and incorporating additional elements like Mg, Ca, or other metals to improve light transmittance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic dye is used as recording layer material, then durability is improved, but optical change for data recording is insufficient when blue or blue violet laser light is used
Solution Approach 1:
The patent changes the chemical composition parameters of the recording layer by using inorganic materials containing Bi and O atoms instead of conventional organic dyes. Specifically, it controls the ratio of O atoms to be 63% or higher, which fundamentally alters the material's optical properties to enable sufficient optical change when irradiated with blue or blue violet laser light, while maintaining durability.
Solution Approach 2:
The patent employs composite inorganic materials containing both Bi and O atoms as the recording layer material. This composite approach combines the advantages of both elements: Bi provides high refractive index and optical contrast, while O ensures chemical stability and durability. The specific composition ratio (O atoms ≥63%) creates a material that satisfies both durability requirements and optical recording performance.
2Manufacturing precision
If inorganic material containing Bi and O is used as recording layer material, then optical change for data recording is improved, but reflectance and light transmittance vary, leading to low recording and reproduction accuracy
Solution Approach 1:
The patent precisely controls the atomic composition ratio of the recording layer material, specifically setting the O atom ratio at 63% or higher. This parameter control stabilizes the material's optical properties, reducing variations in reflectance and light transmittance. By optimizing this composition ratio, the patent achieves both sufficient optical change for recording and consistent optical properties for accurate reproduction.
3Quantity of substance
If inorganic material containing Bi and O is used in multilayer recording type, then recording capacity is improved, but laser light intensity varies between upper and lower recording layers, reducing data recording and reproduction accuracy
Solution Approach 1:
The patent changes the optical properties of the recording layer material by using inorganic Bi-O compounds with specific composition ratios (O atoms ≥63%). This material modification reduces light absorption and maintains more uniform laser light intensity distribution across multiple recording layers, enabling accurate data recording and reproduction in multilayer configurations while increasing overall recording capacity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The increased O atom ratio in the Bi and O-based recording layer ensures reliable data recording and reproduction with blue or blue violet laser light, while the inclusion of other elements improves light transmittance and data preservation characteristics, addressing the accuracy and durability issues in multilayer recording types.
Implementation Method 1
the recording layer having its optical characteristic changed by irradiation of laser light
Implementation Method 2
the difference between the reflectance of areas where recording marks are formed by the irradiation of blue or blue violet laser light and the reflectance of areas where no recording mark is formed
Data Source
AI summary
An optical recording medium is provided, which are capable of recording and reproducing data with reliability even when blue or blue violet laser light is used as irradiation light. The optical recording medium includes a substrate, and a recording layer formed over the substrate and having its optical characteristic changed by irradiation of the laser light. The recording layer is substantially composed of Bi and O, and the ratio of the number of the O atoms to the total number of Bi and O atoms in the recording layer is 63-73%.